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Roadmaster Guardian Rock Guard for Towed Vehicles
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Roadmaster

Roadmaster Guardian Rock Guard for Towed Vehicles

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Get heavy-duty protection for the front of your towed vehicle. Thick polyethylene shield fends off rocks and debris from your bumper and headlights while you're flat towing. Mounts and removes quickly for each trip. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-4000 or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Guardian Rock Guard for Towed Vehicles. Accessories and Parts reviews from real customers.
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Roadmaster Accessories and Parts

  • Tow Bar
  • Vehicle Guards
  • Rock Guard
  • Roadmaster
  • Guardian

Get heavy-duty protection for the front of your towed vehicle. Thick polyethylene shield fends off rocks and debris from your bumper and headlights while you're flat towing. Mounts and removes quickly for each trip.


Features:

  • Protects the entire front bumper of your towed vehicle from rocks and debris
  • Stands up to rough road and weather conditions
    • Made of thick, high-impact polyethylene
  • Mounts and removes quickly
    • Center panel slides onto the quick disconnect brackets and attaches with linch pins
    • Side panels fasten to center panel with slide-in connecting rods
  • Limited lifetime warranty


Specs:

  • Fits: Roadmaster crossbar-style tow bars with quick disconnects
  • Dimensions: 26" tall x 71" long
  • Total weight: 67 lbs


Note: You can swap the Guardian Rock Guard to your second towed vehicle with a second vehicle kit (RM-4000-1 - sold separately).



4000 Road Master Guardian Rock Shield for Toad

Item # RM-4000

Installation Details RM-4000 Installation instructions





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Ratings & Reviews

4.9

57 reviews
5 Stars
(53)
4 Stars
(3)
3 Stars
(1)
2 Stars
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by:
The Roadmaster Guardian is very well made and fit my vehicle perfectly. It is lightweight, but certainly strong enough to protect my truck.
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Etrailer Expert

Brooke M.

7/9/2025

Looks awesome, Chuck! Been on any recent trips where you've had to use it? Where did you go?

by:
Received way earlier than was projected! Installation was a snap, quality of product is as advertised and it is exactly what I need for front end protection! Even with a mud flap on the coach there was still a tremendous amount of gravel hitting the pickup! NO MORE!! Strongly recommend!er
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by:
Simple design, easy to use. Perfect fit for my towed vehicle. No longer have stones sitting on the windshield after a trip.
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by:
Installation was a breeze. Quick to mount, quick to remove, quick to store.
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by:
Very nice and sturdy protection for the front of the towed vehicle. Easy to assemble, attach, remove and store. I was surprised by how rigid it was even at highway speeds.
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by:
I purchased the Roadmaster Crossbar-Style Base Plate Kit w/ Removable Arms, The Roadmaster Nighthawk Tow Bar, Quick Disconnect Crossbar, Universal Hy-Power Diode Wiring Kit, and Roadmaster Guardian Rock Guard in order to tow my 2020 Ford Raptor behind my Class A. Everything bolted on beautifully and the craftsmanship was fantastic. Ordering from etrailer was easy and the parts arrived within a few days with no problem. I watched numerous [online] videos to learn how to install everything and they saved me a lot of time. Overall, I'm very happy.
by:
Best price,free shipping,no tax.what else can i say.patrick did a fantastic job from a to z
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Joe B.

1/28/2018

Really good. thank you!!

by:
Hi George, all the products that I purchased from you guys arrived in a timely manner and installed on my 2017 Jeep. Good instructions and good products. I sent you a picture of my install.
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by:
The rock guard is easy to install. It provides a good amount of protection for the vehicle. It is light fairly light weight sturdy.

I use it on my Ford Xplorer along with the roadmaster rowboat and vehicle brackets
by:
I won't have a chance to actually use this for a couple of weeks, but I have no reason to doubt I will be highly pleased with it as others have been. For now, I just want everyone to know what a FANTASTIC place etrailer is to do business with. My Guardian arrived much sooner than I expected. This is a company that really delivers. Best company I have ever dealt with. I will update my review later. If you are going to get this, I highly recommend the Stowawy which allows you to easily store the Guardian on the hitch receiver on your motorhome.
by:
The parts and hardware all arrived in good shape despite the beat up condition of the box. It was easy to assemble and provided everything I needed to mount to my Roadmaster Tow dolly. Easy to remove the guard and fold up for storage inside. It was a bit expensive, but I'm hoping it will save the front hood and windshield of my Mini.
by:
a good solid product by Roadmaster that looks to protect the front end of my Jeep Grand Cherokee . the install went well with only one small problem, the Stowmaster tow bar pop-ups interfere with the RM-4000 when in the store position. Other than that it is a well built product.
by:
Once you install the guardian carrier installing the Guardian is a breeze. The important step in the installation of the carrier and the guardian is driving your car onto the dolly to make adjustments to the carrier and guardian reference your vehicle. After you get it all together lt looks good and works. I'd buy it again.
by:
Works great with my tow bar system and protects my tow vehicle very well.
Michael profile picture

Michael

10/21/2022

Still working good.

by:
This rock guard will deflect anything you might kick up. Be sure to get the right guard for your tow hitch.
by:
I received the RM-400 on time, watched the installation video and installed it. I haven't used it yet but I'm confident it will do the job keeping the front end of our car protected while towing behind the motorhome.

However, the box didn't have the thumb screws.
by:
The product arrived in two business days, absolutely amazing. Installation was easy and works great. What else can you say? Roadmaster items are well engineered and and always work together when they say it does. As long as you do the research on products, etrailer gets it to you fast.
by:
Received a day earlier than expected. Janice took my order and walked me thru the process on how it attached it. She was right on. Looks good on my 2007 Ford Ranger. Took about a half hour to mount. Every time I order from etrailer. It's always the right part I needed.
by:
The Rock Guard that came is as I ordered. As i had faith it would be. My first time ordering from them. They told me that it was in stock and that it would be shipped the next day and when it would arrive....It all took place...Keep up the good work.
by:
Great product, great price,fast shipping and easy to install..... I also went with the RM# 4750 for the extra protection...... Thanks to Sandy J. for all the help....you're so very helpful...... Adrien A
by:
Looks like a well made product. I have mounted it, but won't road test it until next week. As always prompt shipping from etrailer.
by:
and easy to assemble. Another quality product from Roadmaster.
by:
I towed my 2019 Silverado Pickup behind my Motorhome from Lincoln, NE to Yellowstone National Park and everything worked great and was easy to hook up.
by:
Could not use it, had to change to the Defender - I miss ordered this unit
by:
Easy installation.
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See what our Experts say about this Roadmaster Accessories and Parts

Do you have a question about this Accessories and Part?
  • Solution for Towing 2017 Toyota Prius Behind Motorhome
    You are correct, the 2017 Toyota Prius that you have can only be towed on a dolly behind a motorhome. Good news is it won't put miles on the vehicle since the drive wheels will be on the dolly. I like dolly setups over tow bar setups for a number of reasons. The install time is considerably less, you can easily transfer the towing setup to a different vehicle unlike base plate kits that are vehicle specific, and you don't put miles on the vehicle. The price isn't that different either when...
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  • Will The etrailer Windshield Cover 288-06603 Work On A Towed Vehicle?
    Hey Randall, thanks for reaching out. The etrailer Windshield Cover # 288-06603 really should only be used on a stationary vehicle. If you put it on a towed vehicle, the chances of it tearing or flying off would be high. If it gets caught up in the wind, I would not trust it to stay on. Don't get me wrong, its a solid cover. I own two of them and I put them on our cars here in Missouri every time we get snow and it's a huge convenience when I go to clean the snow off, it just isn't meant...
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  • Will Roadmaster Direct-Connect Base Plate Kit Fit with Guardian Rock Guard
    Hey Bill, thanks for reaching out, although I'm sorry to hear about the circumstances. The Roadmaster Base Plate Kits # RM-524435-4 and # RM-524435-5 for your 2013 Ford Flex connect differently enough that the Roadmaster Guardian Rock Guard # RM-4000 unfortunately won't work with the direct-connect base plate kit. Instead, you'll need to use the Roadmaster Tow Defender Protective Screen # RM-4750. I know it won't be pleasant (I hate confrontations), but you're going to need to see if...
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  • Will the Roadmaster Guardian and Tow Defender Work with the Nighthawk Tow Bar
    I do have an option for you but I spoke with my contact at Roadmaster and they informed me that the Roadmaster Stowaway Storage System part # RM-4000-40 which is used to attach the Roadmaster Guardian Rock Guard part # RM-4000 on the back on an RV will not work with the Roadmaster Tow Defender Protective Screening part # RM-4700. In order to use both the Stowaway and the Guardian on your vehicle with a protective screen you will need to use the Roadmaster Tow Defender Protective Screening...
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  • Recommended Tow Vehicle Protection For Tiffin Motorhome Pulling 2009 Jeep Wrangler Unlimited
    For your Demco Excali-Bar III Non-Binding Tow Bar # DM9511013, I recommend the Rock Tamers Heavy-Duty, Adjustable Mud Flap System for 2" Hitches - Matte Black # ERT00108 or the Access Rockstar 3XL Custom Mud Flaps w/Heat Shield for Modified Suspensions - 47" W - Smooth Finish # A10200213 for even more coverage. Then you can use the Roadmaster Tow Defender Protective Screening # RM-4750 which is compatible with the Demco base plates and tow bar. For a windshield cover, I recommend the...
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  • Will Roadmaster Guardian Shield Fit a 2023 Ford Ranger Tremor?
    Hey Lenny, thanks for reaching out! The Roadmaster Guardian # RM-4000 will fit your 2023 Ranger as long as you're using the Roadmaster Crossbar-Style Base Plate Kit # RM-524459-4 and Quick Disconnect Kit # 910021-00 (or a tow bar that comes with it). The fitment of the Guardian has more to do with the base plate that's on your vehicle as opposed to the vehicle itself. Do you already have a base plate kit?
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  • Will The Roadmaster Stowaway Storage System Work With The Roadmaster Rock Guardian
    The Roadmaster Stowaway Storage System # RM-4000-40 will work with the Rock Guardian # RM-4000 only and that is not compatible with D ring bumper mounts. The Tow defender # RM-4750 however will fold and up store on your motor home and that solution is compatible with D-Ring Bumper mounts. Included are video resources with more information from here.
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  • Parts Needed to Flat Tow 2019 Jeep Cherokee Limited, Latitude or Latitude Plus
    For your 2019 Jeep Cherokee you'll need to first start with a base plate kit. For that you'd want the part # RM-521452-4. This fits the Latitude, Latitude Plus and Limited models. If you have an Overland, Trailhawk, or Trailhawk Elite you'd want the # RM-521451-5. Next you'll need a tow bar which for that the Roadmaster Sterling part # RM-576 is your best option for if you have the Latitude or Limited models since you'll need the included crossbar. If you have an Overland or Trailhawk...
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  • What Flat-Tow Setup do You Recommend for My 2022 Ford Ranger?
    I have a great way to locate installers near you. On each product page, there is a link that says Need help with installation? Locate installers near me." From that link, you can input your zip code and find our recommended installers in your area. I went ahead and attached a screenshot that shows where this link is located. If you need the components for flat-towing, the required parts are base plates, a tow bar, a tow braking system, safety cables, and vehicle tow wiring. For those parts...
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  • Available Options for Rock Guards to Protect Towed Vehicle
    There are other options for protecting your towed vehicle other than the Roadmaster Guardian you mentioned. The Roadmaster Tow Defender, part # RM-4700 stretches between the RV and the towed vehicle, deflecting rocks downward before they can damage your vehicle. The Tow defender attaches to the tow bar and the quick disconnects on the vehicle base plates. We also have the Rock Tamers Mud Flap system, part # ERT00108. These flaps install on the tow bar, and are adjustable.
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  • How to Protect Flat Towed Vehicles Windshield/Paint
    We have great products designed for exactly what you are looking for, but the Hopkins part # HM17529 that you referenced is only designed for snow and ice so it may not prevent damage from debris. Instead you'd need something like the Roadmaster Guardian Rock Guard part # RM-4000 which is designed to attach to a Roadmaster flat towing setup. If you could get back to me with the brand of flat towing setup you have I can check to see what the best solution would be for you. For example,...
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  • Can The Roadmaster Guardian Rock Guard Be Used With A Blue Ox Tow Bar And Base Plate?
    Hi Jack! The Roadmaster Guardian Rock Guard for Towed Vehicles # RM-4000 is really only designed to fit Roadmaster crossbar-style tow bars with quick disconnects, so I can't say what kind of modifications you would need to get it to fit your set up. If you are handy, it can probably be done though. That said, would you be open to a different option? The Demco Sentry Deflector # DM9523135 is a pretty beefy guard and can be adapted to Blue Ox base plates with the Sentry Deflector Adapter...
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  • Parts Needed to Flat Tow a 2021 Ford F-150 w/ a Roadmaster Falcon All-Terrain Tow Bar
    We can get you set up to flat tow your 2021 Ford F-150, and you will need a number of parts, including base plates, in order to do so, though you do already have one with the Roadmaster Falcon All Terrain, Non-Binding Tow Bar # RM-522. Along with the Roadmaster base plates you mentioned, the other things you will need are safety chains (if you don't have them), as well as a wiring kit, brake light relay, and supplemental braking system. I'll go ahead and list out the parts for you to make...
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  • Determining The Correct Towed Vehicle Rock Guard For 2021 GMC Yukon Denali Being Flat Towed
    We offer quite a few different towed vehicle protector options which will work to protect your 2021 GMC Yukon Denali, but the correct one will be dependent on the base plate kit and tow bar you are using. For example the Sentry Deflector for Demco Tow Bars # DM9523135 you were looking at attaches to Demco Base Plate kits and works with all Demco tow bars. If you have a Roadmaster base plate kit with a crossbar I recommend Roadmaster Guardian Rock Guard # RM-4000. If you can tell me...
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  • Flat Towing Base Plates for a 2010 Mini Cooper S Hartop
    I reached out to Blue Ox and there is not a confirmed fit for your 2010 Mini Cooper S Hardtop, but I do have a solution for you. I recommend the Roadmaster EZ Base Plate Kit - Removable Arms # 521877-1 which is confirmed to fit your Model S Hardtop. Then I recommend the Roadmaster Falcon 2 # RM-520 for your tow bar and # RM-643 for your safety cables. You can use the plugs # RM-210 when not in use if desired. For your wiring, I recommend the Roadmaster LED Bulb and Socket Kit # RM-152-LED....
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  • Looking For A Flat Tow Set Up On My 2021 Jeep Wrangler Towed Behind A Coach
    Hey James, You hit that on the spot with those parts. All of those are compatible and a great option for your jeep. One thing that I recommend adding to that list is part # RM-156-25. The Roadmaster braking system does say that it trickle charges the battery when towing, however what we have noticed is that is only when the coach has its headlights on. So adding this charge line will trickle charge any time when towing which is always a good thing to have. Other than that what you put...
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  • Do Roadmaster Guardian or Tow Defender Rock Guard Rub Against Motorhome
    Hey there Terry; thanks for the question and the answer is neither the Roadmaster Tow Defender # RM-4750 or Roadmaster Guardian Rock Guard # RM-4000 will rub against the motorhome when making turns. Keep in mind the right one will depend on the Roadmaster base plates you have. the Tow Defender is for direct-connect base plates while the Guardian is for crossbar-style base plates.
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  • Roadmaster Baseplate Compatibility with Roadmaster Guardian
    Thanks for letting us help, Otto. For Roadmaster Direct-Connect style base plates like # RM97NQ, the correct Roadmaster Guardian is the Roadmaster Guardian XL Rock Shield # RM82DQ. The original Roadmaster Guardian Rock Guard # RM-4000 is designed for crossbar-style base plates and will not work with a Direct-Connect setup. Do you already have a Guardian and only need the second vehicle mounting brackets? We currently carry the Roadmaster Guardian Rock Guard for Towed Vehicles - 2nd Vehicle...
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  • Does The Roadmaster Guardian Rock Guard RM-4000 Work With Crossbar-Style Base Plate RM-521884-4?
    Hello James, thanks for reaching out. The Roadmaster Guardian Rock Guard # RM-4000 does work with the Roadmaster Crossbar-Style Base Plate Kit # RM-521884-4. The Rock Guard is compatible with all of the Roadmaster crossbar-style tow bars. The picture below shows a good example of what that will look like. Let me know if you have any other questions.
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  • Flat Tow Vehicle While Also Using Bike Carrier
    Yes, this is exactly what the MaxxTow Dual Hitch Extender for 2" Trailer Hitches, # MT70070 is intended for. However, keep in mind that per manufacturer this reduces your hitch rating by 50%. The extender has a weight rating of 400 lbs. tongue weight and gross trailer weight rating of 4,000 lbs. so please compare this to the vehicle you are flat towing. While the # MT70070 is designed to allow you to add an accessory such as a bike rack and use the tow bar, you cannot use an additional...
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    Image 1 for
  • Comparing the Roadmaster Direct-Connect and Crossbar-Style Base Plate Kits
    The only difference between the Roadmaster Direct-Connect Base Plate Kits like part # RM-523179-5 and the Roadmaster Crossbar-Style Base Plate Kits like part # RM-523179-4 are the removable arms. The Direct-Connect style means you can attach a tow bar to this like the Roadmaster Nighthawk All Terrain Tow Bar part # RM-677 without the need for a crossbar to go between the two arms. The Crossbar-Style style means you will need the crossbar that goes between the two arms like the Roadmaster...
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  • Will the Roadmaster Guardian Rock Guard Work With Blue Ox Tow Bars
    I do have a very similar vehicle guard option but the Roadmaster Guardian Rock Guard part # RM-4000 will not work with a Blue Ox Tow Bar as it is specific to Roadmaster Tow Bars. Instead, the Blue Ox KarGard Towed Vehicle Protector part # BX8870 is what you will want to use and offers just as much protection as the Roadmaster Guardian Rock Guard.
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  • How to Protect a Toad from Chips or Scratches While in Tow
    The Snoblock Snow and Ice Windshield and Wiper Blade Cover part # 288-06603 is not designed to be used on a moving vehicle. If used in this fashion then the chances of it tearing would be increased therefore I cannot recommend this. However, we do still have multiple ways of protecting your toad while in tow and not just the windshield portion either. For this, I recommend taking a look at Sentry Deflector part # DM9523135 if you have a Demco Tow Bar, the Guardian Rock Guard part # RM-4000...
    view full answer...
  • What Is Difference Between Roadmaster Tow Defender # RM-4700 And # RM-4750
    The difference between the # RM-4700 and the # RM-4750 is being able to use them with your base plates. If you have the crossbar on your base plates you will need part # RM-4700. The RM-4750 is not compatible with other style base plates. Since you said you have the Roadmaster Guardian, part # RM-4000, the same issue applies. It is compatible with the base plates that have a crossbar and will not work if you have other style base plates.
    view full answer...


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